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Financial Instruments - Investments by Category and Related Balance Sheet Presentation, and AFS in Continuous Loss Position (Details) - USD ($)
$ in Millions
Jan. 29, 2016
Apr. 24, 2015
Available-for-sale securities:    
Cost $ 15,082 $ 14,734
Unrealized Gains 114 205
Unrealized Losses (504) (193)
Fair Value 14,692 14,746
Trading securities:    
Cost 65 58
Unrealized Gains 12 19
Unrealized Losses (2) 0
Fair Value 75 77
Cost method, equity method, and other investments:    
Cost 524 520
Total investments [Abstract]    
Cost 15,671 15,312
Unrealized Gains 126 224
Unrealized Losses (506) (193)
Fair Value 14,767 14,823
AFS Continuous Unrealized Loss Position    
Less than 12 months, Fair Value 5,441 2,941
Less than 12 months, Unrealized Losses (160) (141)
More than 12 months, Fair Value 2,152 1,171
More than 12 months, Unrealized Losses (346) (52)
Investments [Member]    
Available-for-sale securities:    
Fair Value 14,490 14,560
Trading securities:    
Fair Value 75 77
Cost method, equity method, and other investments:    
Cost 0 0
Total investments [Abstract]    
Fair Value 14,565 14,637
Other Assets [Member]    
Available-for-sale securities:    
Fair Value 202 186
Trading securities:    
Fair Value 0 0
Cost method, equity method, and other investments:    
Cost 524 520
Total investments [Abstract]    
Fair Value 726 706
Level 1 [Member]    
Available-for-sale securities:    
Cost 1,594 1,589
Unrealized Gains 38 52
Unrealized Losses (6) (20)
Fair Value 1,626 1,621
Trading securities:    
Cost 65 58
Unrealized Gains 12 19
Unrealized Losses (2) 0
Fair Value 75 77
Level 1 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 1,530 1,541
Trading securities:    
Fair Value 75 77
Level 1 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 96 80
Trading securities:    
Fair Value 0 0
Level 2 [Member]    
Available-for-sale securities:    
Cost 13,378 13,035
Unrealized Gains 76 153
Unrealized Losses (491) (169)
Fair Value 12,963 13,019
Level 2 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 12,960 13,019
Level 2 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 3 0
Level 3 [Member]    
Available-for-sale securities:    
Cost 110 110
Unrealized Gains 0 0
Unrealized Losses (7) (4)
Fair Value 103 106
Cost method, equity method, and other investments:    
Cost 524 520
Level 3 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 0 0
Cost method, equity method, and other investments:    
Cost 0 0
Level 3 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 103 106
Cost method, equity method, and other investments:    
Cost 524 520
Corporate debt securities [Member]    
AFS Continuous Unrealized Loss Position    
Less than 12 months, Fair Value 2,817 944
Less than 12 months, Unrealized Losses (80) (9)
More than 12 months, Fair Value 186 34
More than 12 months, Unrealized Losses (16) (1)
Corporate debt securities [Member] | Level 2 [Member]    
Available-for-sale securities:    
Cost 6,568 6,282
Unrealized Gains 56 105
Unrealized Losses (95) (10)
Fair Value 6,529 6,377
Corporate debt securities [Member] | Level 2 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 6,526 6,377
Corporate debt securities [Member] | Level 2 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 3 0
Corporate debt securities [Member] | Level 3 [Member]    
Available-for-sale securities:    
Cost 1 1
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 1 1
Corporate debt securities [Member] | Level 3 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 0 0
Corporate debt securities [Member] | Level 3 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 1 1
U.S. government and agency securities [Member]    
AFS Continuous Unrealized Loss Position    
Less than 12 months, Fair Value 716 356
Less than 12 months, Unrealized Losses (1) (1)
More than 12 months, Fair Value 103 267
More than 12 months, Unrealized Losses 0 (3)
U.S. government and agency securities [Member] | Level 1 [Member]    
Available-for-sale securities:    
Cost 1,517 1,525
Unrealized Gains 14 17
Unrealized Losses (1) (1)
Fair Value 1,530 1,541
U.S. government and agency securities [Member] | Level 1 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 1,530 1,541
U.S. government and agency securities [Member] | Level 1 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 0 0
U.S. government and agency securities [Member] | Level 2 [Member]    
Available-for-sale securities:    
Cost 1,683 1,597
Unrealized Gains 4 4
Unrealized Losses (1) (3)
Fair Value 1,686 1,598
U.S. government and agency securities [Member] | Level 2 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 1,686 1,598
U.S. government and agency securities [Member] | Level 2 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 0 0
Marketable equity securities [Member]    
AFS Continuous Unrealized Loss Position    
Less than 12 months, Fair Value 51 4
Less than 12 months, Unrealized Losses (6) (19)
More than 12 months, Fair Value 0 0
More than 12 months, Unrealized Losses 0 0
Marketable equity securities [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 96 80
Marketable equity securities [Member] | Level 1 [Member]    
Available-for-sale securities:    
Cost 77 64
Unrealized Gains 24 35
Unrealized Losses (5) (19)
Fair Value 96 80
Marketable equity securities [Member] | Level 1 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 0 0
Marketable equity securities [Member] | Level 1 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 96 80
Mortgage-backed securities [Member]    
AFS Continuous Unrealized Loss Position    
Less than 12 months, Fair Value 626 346
Less than 12 months, Unrealized Losses (11) (3)
More than 12 months, Fair Value 223 206
More than 12 months, Unrealized Losses (6) (3)
Mortgage-backed securities [Member] | Level 2 [Member]    
Available-for-sale securities:    
Cost 1,407 1,462
Unrealized Gains 12 22
Unrealized Losses (16) (6)
Fair Value 1,403 1,478
Mortgage-backed securities [Member] | Level 2 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 1,403 1,478
Mortgage-backed securities [Member] | Level 2 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 0 0
Foreign government and agency securities [Member] | Level 2 [Member]    
Available-for-sale securities:    
Cost 27 85
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 27 85
Foreign government and agency securities [Member] | Level 2 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 27 85
Foreign government and agency securities [Member] | Level 2 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 0 0
Certificates of deposit [Member] | Level 2 [Member]    
Available-for-sale securities:    
Cost 28 44
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 28 44
Certificates of deposit [Member] | Level 2 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 28 44
Certificates of deposit [Member] | Level 2 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 0 0
Other asset-backed securities [Member] | Level 2 [Member]    
Available-for-sale securities:    
Cost 517 504
Unrealized Gains 3 3
Unrealized Losses 0 0
Fair Value 520 507
Other asset-backed securities [Member] | Level 2 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 520 507
Other asset-backed securities [Member] | Level 2 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 0 0
Debt funds [Member]    
AFS Continuous Unrealized Loss Position    
Less than 12 months, Fair Value 1,231 1,291
Less than 12 months, Unrealized Losses (62) (109)
More than 12 months, Fair Value 1,538 559
More than 12 months, Unrealized Losses (317) (41)
Debt funds [Member] | Level 2 [Member]    
Available-for-sale securities:    
Cost 3,148 3,061
Unrealized Gains 1 19
Unrealized Losses (379) (150)
Fair Value 2,770 2,930
Debt funds [Member] | Level 2 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 2,770 2,930
Debt funds [Member] | Level 2 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 0 0
Auction rate securities [Member]    
AFS Continuous Unrealized Loss Position    
Less than 12 months, Fair Value 0 0
Less than 12 months, Unrealized Losses 0 0
More than 12 months, Fair Value 102 105
More than 12 months, Unrealized Losses (7) (4)
Auction rate securities [Member] | Level 3 [Member]    
Available-for-sale securities:    
Cost 109 109
Unrealized Gains 0 0
Unrealized Losses (7) (4)
Fair Value 102 105
Auction rate securities [Member] | Level 3 [Member] | Investments [Member]    
Available-for-sale securities:    
Fair Value 0 0
Auction rate securities [Member] | Level 3 [Member] | Other Assets [Member]    
Available-for-sale securities:    
Fair Value 102 105
Exchange-traded funds [Member] | Level 1 [Member]    
Trading securities:    
Cost 65 58
Unrealized Gains 12 19
Unrealized Losses (2) 0
Fair Value 75 77
Exchange-traded funds [Member] | Level 1 [Member] | Investments [Member]    
Trading securities:    
Fair Value 75 77
Exchange-traded funds [Member] | Level 1 [Member] | Other Assets [Member]    
Trading securities:    
Fair Value $ 0 $ 0